I am trying to play HD content recorded OTA from a shared folder on a Vista/MCE machine, and get significant stutter/jitter after ~5 seconds of play time.  This only occurs using wireless, and only HD content.  I can play ripped DIVX/AVI/etc files wired or wireless without issue.  My access point is 15 feet from the DSM510 in a direct line of sight and no metal ducts or other obstructions.  The AP is a 3Com 7760 with b/g capability, and is the only device connected to this AP.
I assume since there is HDMI output, the DSM510 should be able to support HD via wireless.  What is the minimum speed needed?
Is anyone else having this issue?
Thanksin advance.